Method of forging brake-beam trunnions



L. L. WHITNEY.

METHOD OF FORGING BRAKE BEAM TRUNNIONS.

-APPLICATION FILED mus, 1920.

1,434,865. Patented Nov. 7, 1922.

I?! I p I ""WIJHIHF Hill I i! 7E?" .54 J0 fi wn 1H AL X453. 10

(MINIMUM I Patented Noun 7, i923? Uttt't iiit .iMERIC/iill' STEEL NEVIMETHOU OF BBAIZE-BEi-UEE TRUNNIQNS.

Application filed April 28,

T 0 all whom it may concern:

Be it known that I, LoRnN L. W'HrTNEY a citizen of the United States.residing Hammond in the county of Lake and State of Indiana. haveinvented certain new and useful Improvements in Methods of ForgingBrake-Beam Trunnions, of which the following is a specification.

This invention relates to a method for forging brake beam trunnions.

An object of this invention to simplify and improve the methods offorging brake beam trunnions reducing the cost of manufacture and at thesame time providing a brake beam trunnion adapted to meet therequirements for successful commercial use.

lhis and other objects are accomplished by means of the method disclosedon the accompanying sheet of drawings, in which- Figures 1 and 2 areend. and top plan views respectively of a brake beam blank;

Figures 3 and i are end and top plan views of the same blank after beingupset;

Figures 5 and 6 are end and top plan views of the same blank after beingfurther upset;

Figures 7 and 8 are end and top plan views of the blank after beingstill further upset. the blank now being shown as provi ded withsufficient built-up stock necessary for succeeding operations;

Figures 9 and 10 are end and top plan views of the blank after the endhas been drawn out a predetermined amount under a steam hammer betweensuitable dies;

Figures 11 and 12 are end and top plan views of the same blank after theend of the blank has been subjected to pressure between dies of a drophammer to its completed form. with the exception of the tin; and

Figures and 14 are end and top plan views showing the brake beamtrunnion in finished form.

It will be noted from the figures of the drawings that only a portion ofthe brake beam has been shown, itbeing understood that the opposite endof same will appear as the end shown.

The type of brake beam shown is of the 1920. Serial No. 377,158.

plain II section. In forming the trunnion a commercial brake beam blank10 of I section provided. shown in Figures 1 and 2. The end of the blankis then heated and upset a predetermined amount in any suitablewelldrnown type of upsetting machine, giving the end of the blank anappearance as shown in Figures 3 and 4. The end of the blank is thenupse an increased amount as shown in Figures 5 and 5, and then subjectedto a third upsetting action. giving end oi the blank built-up portion 11at stock, as shown in Figures 7 and 8 preparatory to the succeedingoperations. It will be understood that during all of these upsettingactions the blank 10 is properly gripped between suitable dies tocontrol the upsetting at the proper points. The end oi? the beam is thendrawn out under a steam hamer bet-ween. suitable dies to the form shownin Figures 9 and 10, giving; the trunnion portion 12 its first roundedappearance. The trunnion port-ion is then subjected to pressure betweenthe dies of a drop hammer giving; the trunnion an appearance as shown inFigures 11 and there being a fin or dash 13 termed around the trunnionand between tbe adjacent portions of the coopersiting; dies. The fin orflash is then removed, leaving; the brake beam trunnion 14.- in. itsfinished form. shown in Figures 13 and let. the trunnion being providedwith a shoulder 15.

It is my intention to cover all modifications of the invention fallingwithin the spirit and scope 0'? the following claim.

I claim:

The method of forming a brake beam trunnion, consisting in providing ablank. heating said blank, upsetting same to build up the stool: for thetrunnion, drawing out the built-up portion to approach the finaltrunnion shape. and subjecting said drawnout portion to a furtherdrawing-out action between dies to give the trunnion its final shape.

Signed at Hammond, Indiana, this 22 day of April, 1920.

LOREN L. WHITNEY.

